Changed file names following name convention with file/class name
major refactoring: creating a file per class
completed elementTree and tested 'import' in TestLink

Found bugs:
1. CDATA not escaped
2. all step_number set to 0
3. preconditions not in multi lines
4. testcase title not having space after :
replaced ElementTree with lxml fixing CDATA bug and step_number bug.

#1, #2 bug fixed
renamed data2LXml for atomic operation on signle testsuite
Merge branch 'dev_test' into master_bk

Conflicts:
	TestLink/testlinkElementTree.py